Bump ruby/setup-ruby from 1.202.0 to 1.221.0

Bumps [ruby/setup-ruby](https://github.com/ruby/setup-ruby) from 1.202.0 to 1.221.0.
- [Release notes](https://github.com/ruby/setup-ruby/releases)
- [Changelog](https://github.com/ruby/setup-ruby/blob/master/release.rb)
- [Commits](ruby/setup-ruby@a2bbe5b...32110d4)

---
updated-dependencies:
- dependency-name: ruby/setup-ruby
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/publish-gem.yml

@@ -14,7 +14,7 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v4
       - name: Setup Ruby
-        uses: ruby/setup-ruby@a2bbe5b1b236842c1cb7dd11e8e3b51e0a616acc
+        uses: ruby/setup-ruby@32110d4e311bd8996b2a82bf2a43b714ccc91777
         with:
           ruby-version: "3.3"
       - name: Build gem